python关于列表与集合之间的转换

**# ‘’‘列表与字符串的相互转换’’’

 str_new = 'hello world'
 str_to_list = list(str_new)
 print(list(str_new))

 print(str_new.split())

print(’#############################’)

 list_new = ['hello','world','!']
 str1 = ''
for i in list_new:
    str1 +=i
 print(str1)    #print对应的是for而不是str1

print(’################第二种方法##############’)

join

  Example:str= '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'
 str2 = ''.join(list_new)    #将列表转换成字符串
 print(str2)

print(‘第三种***’)

str3 = ''.join([str(j) for j in list_new])
print(str3)**